Often called the "most polluted sea in the world," its slow water turnover (roughly 30 years for a full exchange) causes toxins to linger for decades.
State of the Baltic Sea – Third HELCOM holistic assessment baltic sea
Approximately 94% of the sea is impacted by excessive nutrients, leading to "dead zones" roughly 1.5 times the size of Denmark. Often called the "most polluted sea in the
The is currently classified in "poor environmental status," as detailed in the comprehensive State of the Baltic Sea 2023 report. While regional efforts have successfully reduced nutrient inputs in some areas, the overall ecosystem remains under severe pressure from eutrophication , pollution , and climate change . Environmental Status & Ecology In early 2026, experts noted a rapid loss
Key indicators for fish stocks, waterbirds, and marine mammals have failed to meet health thresholds. The Baltic harbour porpoise population is critically low, with only about 500 individuals remaining.
In early 2026, experts noted a rapid loss of water (275 billion tonnes), leaving levels 67 cm below average due to atmospheric factors. Maritime & Economic Activity